Lexus GS 300 - Recent Questions, Troubleshooting & Support

Yes the O2 sensor preheater problem will turn on the VSC light, see the complaint often, why? don't know.P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1In most cases the O2 being replaced cures the code but here is the full story.Possible causes- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit open shorted to ground- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection- Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit fuse- Faulty Engine Control Module (ECM)

I do think you have a leaking engine cylinder gasket or a cracked cylinder head.

I have a a 99 gs 300, check engine light is on as well as the vsc light. What is that and needs to be to done to fix it.

you might find what you want below http://www.clublexus.com/forums/gs-third-generation/257984-adjusting-the-drivers-headrest.html

If you have one of the rear tires leaning in then you have damaged the upper control arm or spindle is bent. Have the vehicle suspension checked for damaged components and have alignment done You are also dealing with 24 to 25 year old parts that may be worn.

$5 donation to get the Service Manual from the first link. https://www.google.com/search?q=1995+lexus+gs300+repair+manual+pdf ..

If the immobilizer is worth anything, it will not work at all.

Question translated into written English. Question edited for full year make model as required. Question moved to to 2006 Lexus GS300 category 2005, 2006, 2007 are the generation years that remain the same. You could also try cleaning with a light application of acrylic polish. https://www.google.com/search?q=gs300 https://www.google.com/search?q=2006+lexus+gs300+audio+system ..

From the clicking and knocking, that sounds like low coolant level. It happened to me on my ES330. The block heater popped out due to a bad new replacement, they used the old bracket on a new heater. All your codes are misfires. Go to another mechanic. The popped plug can be fixed cheaply with a Helicoil Insert. Then check or replace all the spark plugs. Then reset the codes. Your reduced speed is 'Limp Mode'. From everything you say, I believe you have a coolant leak or coolant issues, which can cause misfires. I just remembered my ES had to have a new radiator about 6 years ago as it was leaking badly. https://www.google.com/search?q=helicoil+spark+plug+thread+repair+insert https://www.google.com/search?q=Lexus+codes+P0300+P0306+and+P0303 I have the FIXD Sensor and App and do my own code stuff. It is basic but does the job. P0300 Causes Multiple misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it's been a while since you had a tune-up.Mar 14, 2018

P0300 - Meaning, Causes, Symptoms, & Fixes - FIXD

you have multiple cylinder missfire 1,2,3,5 check your spark plugs, plug wires and coils could even be a o2 sensor

P0715 is a generic code for the input turbine speed sensor A. P0715 is detected when TCM or ECM does not receive the proper signal from the sensor. Take a look at any damage to the loom wiring, including connectors before replacing the sensor.

with enough fabrication and a software reprogram

Your going to have to try and crawl in there and get to the lock mechanism itself. If it doesn't open with the emergency release cable its going to be a pain. Obviously its jammed up somehow, to free it up without damaging anything will be a struggle. A long screwdriver with some pressure in the right spot on the lock itself while a assistant operates the release may do the trick.

Check this components:
- The Relay - Tail Lamps: is located front seating area, driver side, driver side of steering column, under dash, below instrument panel, mounted in fuse/relay box;
- The Relay - Sunroof: is located front seating area, center, behind head panel, front of sunroof panel, mounted on driver side of head panel;
- The Relay - Main: is located front seating area, driver side, under dash, above kick panel, in relay block, mounted on upper panel;

Look into those things first:
- Battery termials loose?
- Barttery itself loose grounding out to the underside of the hood?
- Door and trunk wiring harness iffy? (esp trunk), and,
- Crazy lighting mods?

Using the 12v from the cig lighter to trigger any other relays etc?

So, maybe a bad batch of fuses, I remember I had the same problem once. Got a pack from Walmart all went bust, got a pack from an auto store and it worked fine.

I hope help you with this.

The purge valve is mounted in the engine compartment, probably on the firewall. It is held on by two bolts. It has an electrical connector and two vacuum hoses and looks like the pic below. . Release the connector and unscrew the two bolts. Move the vacuum lines from the old valve to the new one. Bolt the new valve down and connect the wiring harness.

Check behind the ash tray.

Hi there,

This is a possible sensor malfunction - related to Suspension Height circuit.

Whenever a warning light of this nature is displayed, your vehicle's onboard diagnostic OBDII will have store the appropriate Trouble Codes.

Your local Lexus Dealership will be able to connect their handheld scanner to your vehicle's computer, which will then tell them where the problem lies (this would take less than 30mins to diagnose - marvellous machines they are!)

Lexus will then direct you on the appropriate action.

Cheers,


"If this has helped you in any way, please rate this solution" :-)

I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would start...it happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from RockAuto.com (exacly same part toyota OEM)

THE PART THAT FIXED THE PROBLEM:
===========================================
"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

How many air fuel ratio sensor and oxygen sensors does a 2003 Lexus ES300 have and can I have a diagram of each sensor and where each sensor goes thank you

More detail please? Fuel lever? How long does it runs until dying again?